Throughout much of the world, night skies are growing increasingly brighter, but the force that protects the remaining naturally dark sky, unpolluted by artificial light, is the same that saves its ancient trees--isolation. Staking out some of the world's last dark places, photographer Beth Moon uses a digital camera to reveal constellations, nebulae, and the Milky Way, in rich hues that are often too faint to be seen by the naked eye. As in her...